diff --git a/scripts/04_cumsum.R b/scripts/04_cumsum.R
index c31cdde1373f26b9b201ff4b1f9a774a6103e0f0..5b99baf4263431aa809c3be6915d952d63fe412b 100644
--- a/scripts/04_cumsum.R
+++ b/scripts/04_cumsum.R
@@ -58,3 +58,5 @@ cusum(x[1:20],
       newdata = x[21:30])
 
 #-----------------------------------------------------------------------
+
+ewma(data = x[1:20], newdata = x[21:30], lambda = 0.1)